Wiktionary
knob-and-tube
a. Of or pertaining to a type of electrical wiring widely used in North America during the late 19th and early 20th centuries, consisting of insulated conductive copper wire which was affixed by porcelain hardware and protected in vulnerable areas by insulated cloth sleeving. alt. Of or pertaining to a type of electrical wiring widely used in North America during the late 19th and early 20th centuries, consisting of insulated conductive copper wire which was affixed by porcelain hardware and protected in vulnerable areas by insulated cloth sleeving.
Usage examples of "knob-and-tube".
The ancient knob-and-tube wiring was clearly visible among the floor joists overhead, and the thirty-amp fuse box was a joke.